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  • [FreeBSD-Announce] FreeBSD Errata Notice FreeBSD-EN-21:13.mpt

    From FreeBSD Errata Notices@21:1/5 to All on Thu May 27 01:00:01 2021
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    ============================================================================= FreeBSD-EN-21:13.mpt Errata Notice
    The FreeBSD Project

    Topic: mpt(4) I/O errors with a large maxphys value

    Category: core
    Module: mpt
    Announced: 2021-05-26
    Affects: FreeBSD 13.0
    Corrected: 2021-04-24 00:43:14 UTC (stable/13, 13.0-STABLE)
    2021-05-26 19:29:54 UTC (releng/13.0, 13.0-RELEASE-p1)

    For general information regarding FreeBSD Errata Notices and Security Advisories, including descriptions of the fields above, security
    branches, and the following sections, please visit <URL:https://security.FreeBSD.org/>.

    I. Background

    mpt(4) is a driver for LSI disk controllers.

    II. Problem Description

    The mpt(4) driver did not correctly handle I/O requests larger than or
    equal to 2MB and would incorrectly report errors. The I/O request size
    is limited by the value of the kern.maxphys tunable and the default
    value is below this threshold.

    III. Impact

    With kern.maxphys set to 2MB or larger, I/O to mpt(4) devices will not
    work correctly.

    IV. Workaround

    To work around the problem, ensure that the kern.maxphys value is kept
    at its default value.

    V. Solution

    Upgrade your system to a supported FreeBSD stable or release / security
    branch (releng) dated after the correction date and reboot.

    Perform one of the following:

    1) To update your system via a binary patch:

    Systems running a RELEASE version of FreeBSD on the amd64, i386, or
    (on FreeBSD 13 and later) arm64 platforms can be updated via the freebsd-update(8) utility:

    # freebsd-update fetch
    # freebsd-update install
    # shutdown -r +10min "Rebooting for an erratum update"

    2) To update your system via a source code patch:

    The following patches have been verified to apply to the applicable
    FreeBSD release branches.

    a) Download the relevant patch from the location below, and verify the
    detached PGP signature using your PGP utility.

    # fetch https://security.FreeBSD.org/patches/EN-21:13/mpt.patch
    # fetch https://security.FreeBSD.org/patches/EN-21:13/mpt.patch.asc
    # gpg --verify mpt.patch.asc

    b) Apply the patch. Execute the following commands as root:

    # cd /usr/src
    # patch < /path/to/patch

    c) Recompile your kernel as described in <URL:https://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the
    system.

    VI. Correction details

    This issue is corrected by the corresponding Git commit hash or Subversion revision number in the following stable and release branches:

    Branch/path Hash Revision
    - ------------------------------------------------------------------------- stable/13/ f0077b4c1dcf stable/13-n245384 releng/13.0/ a8a91efa74e0 releng/13.0-n244734
    - -------------------------------------------------------------------------

    Run the following command to see which files were modified by a
    particular commit:

    # git show --stat <commit hash>

    Or visit the following URL, replacing NNNNNN with the hash:

    <URL:https://cgit.freebsd.org/src/commit/?id=NNNNNN>

    To determine the commit count in a working tree (for comparison against
    nNNNNNN in the table above), run:

    # git rev-list --count --first-parent HEAD

    VII. References

    The latest revision of this advisory is available at <URL:https://security.FreeBSD.org/advisories/FreeBSD-EN-21:13.mpt.asc> -----BEGIN PGP SIGNATURE-----

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